Condemns strikes (6)
I believe the answer is:
knocks
This could be a double definition.
'condemns' is the first definition.
The definition and answer can be both to do with perception as well as being verbs in their -s form.
Perhaps there's an association between them I don't understand?
'strikes' is the second definition.
(knocking is a kind of striking)
Can you help me to learn more?
(Other definitions for knocks that I've seen before include "Reversals" , "Raps on the door" , "criticisms" , "Hits" , "Strikes with a sharp blow or finds fault with" .)